# URSim on M1 Macbook

**URL:** <https://forum.universal-robots.com/t/ursim-on-m1-macbook/14668>\
**Category:** Technical Questions\
**Created:** [June 2, 2021, 7:22am UTC](https://forum.universal-robots.com/t/ursim-on-m1-macbook/14668 "2021-06-02T07:22:25Z")\
**Posts on this page:** 1\
**Showing post:** 8

<div class="post-metadata">

**Author:** ![felix.green](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/felix.green/32/6215_2.png) [@felix.green](https://forum.universal-robots.com/u/felix.green)\
**Post date:** [May 15, 2024, 3:17pm UTC](https://forum.universal-robots.com/t/ursim-on-m1-macbook/14668/8 "2024-05-15T15:17:54Z")

</div>

I am on an M3 Macbook Pro. I can run URsim, but the controller stays off and can’t be turned on. Exactly like in this post:

> [@URSim on M1 Macbook](https://forum.universal-robots.com/t/ursim-on-m1-macbook/14668/7):
>
> The container runs fine and I can connect to it via VNC-Viewer on localhost:5900. However, I do get the “No Controller” Error and can not do anything with the simulator. Did you run into this? If so how did you fix it? It does appear that there is a general incompatibility of the URControl binary with arm64 systems even with virtualization. There is always some sort of error no matter what I try.

When digging through the logs, I discovered this error:

```auto
Mutex, Unknown - Could not set the attributes. Error code = 95
Unknown Mutex::Mutex() calling exit(-1)

```

It seems to be related to this issue: [URControl: Unknown Mutex::Mutex() calling exit (-1)](https://forum.universal-robots.com/t/urcontrol-unknown-mutex-mutex-calling-exit-1/25865)

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